SU1672075A1 - Electric drive - Google Patents

Abstract

This invention relates to a valve industry. The purpose of the invention is to increase the reliability of operation by turning off the electric motor when the permissible torque is exceeded. With increasing torque on the drive shaft 7 of the gearbox beyond a pre-set value, the movable coupling half 5 starts axial displacement. When the coupling half 5 contacts the stop 14, the latter begins to rotate around the axis 15, and the direction of the moment changes around this axis, which leads to further rotation of the stop 14 and axial movement of the movable sleeve 11, which, interacting with the switch 12, turns off the electric motor and after The repeated stop of the bearing 9 rigidly connected with it into the coupling half 5 produces a complete separation of the torque limiting clutch. The return of moving parts to their original position is carried out by turning the axis 15. 3 sludge.

Description

Financial instrument

The invention relates to reinforcement.

The purpose of the invention is to increase the reliability of the drive through the use of a special automatic lock that ensures the shutdown of the electric motor when the allowable torque exceeds.

Figure 1 presents the proposed drive, a General view; Figures 2 and 3 show the position of the parts of the two-way torque limiting clutch, respectively, in the initial and final period of operation.

The electric drive contains an electric motor 1, a reducer 2 and an intermediate case 3. On the motor shaft there is a fixed intermediate sleeve 4, on which the moving coupling half 5 of the torque limiting coupling coupled to the fixed coupling half 6 rigidly connected to the drive shaft 7 of the gearbox can move axially . The axial force between the coupling halves 5 and 6 is provided by a spring 8. mounted on the intermediate sleeve 4 with the possibility of adjusting the adjusting force. The coupling half 5 rotates in the bearing 9 and can be moved in it in the axial direction. The spring acts on the bearing, the second end of which rests against the intermediate casing 3 with the possibility of adjusting the adjusting force. On the outer surface of the bearing is rigidly mounted movable sleeve 11 with surface A and shank B. moving in the intermediate housing 3.

The surface And interacts with the electric switch 12 of the engine, and the shank B with the ball 13 mounted on the stop 14, which is rigidly mounted on the rotary axis 15.

In the movable popumufta 5, a rigid washer 16 is fixed, against which the roller 17 rests, which is mounted in the cavity of the drive shaft 7 of the gearbox with the possibility of axial movement. At the end of the drive shaft 7, a half-coupling 18 of a handwheel 18 is realized, interacting with a movable driving half coupling 19 of the rod 20, which is pressed against the roller 17 by a spring 21. A flywheel 22 is mounted on the rod.

The drive works as follows.

When the motor 1 is turned on, the rotation of its shaft is transmitted by the intermediate sleeve 4 and the movable coupling half 5 of the clutch limiting the torque of the moment to the fixed popumufta G), and from it to the drive shaft

7 of the gearbox 2, from which the torque developed by the electric motor is transmitted to the control object. Coupling torque limiting clutch

This is provided by the spring 8. The position of the rotary axis 15 is set so (Fig. 1) that, when the torque limiter coupling is closed, the contact force between the shank B and the ball 13 from the action of the spring 10 creates a moment around the axis 15, which is in this initial position perceived by the intermediate casing 3, whereby the movement of the moving parts under the action of the spring 10 does not occur (the structural elements ensuring the closure of the specified moment to the intermediate casing are not shown). They can be performed by any of the known methods

0, for example, with a pin rigidly connected to the pivot axis 15 and abutting against the extreme positions of the abutment 14 in the respective surfaces of the intermediate body 3.

5 When torque increases by

to the drive shaft 7 of the gearbox above a predetermined value, the movable coupling half 5 begins axial movement (FIG. 2). Upon contact of the coupling half 5 with emphasis

0 14 the latter begins to rotate around the axis 15, and the direction of action of the moment around this axis changes. which leads to further rotation of the stop 14 and the axial movement of the movable sleeve

5 11, which, interacting with the switch 12, switches off the electric motor and, after re-abutting the bearing 9 rigidly connected with it into the coupling half 5, produces a complete disconnection of the clutch for torque limiting (fig. 3). The return of moving parts to their original position is carried out by turning the axis 15.

For manual control, the axial movement of the flywheel 22 is first performed.

5 to the closure of the coupling half 18 and 19 manual backup. The rod 20 then moves the roller 17, which, in contact with the thrust washer 16, disengages the torque limiter clutch and turns off

0 motor or provides blocking from motor starting in case the torque limiting clutch is switched off due to overload.

Claims (1)

5 Formula of Invention An electric actuator containing an electric motor, a gearbox with a handwheel in the form of a rod and coupling half couplings and a clutch of torque limitation in the form of a spring-loaded movable and stationary coupling half. different in that. that, in order to increase the reliability of operation, it is equipped with an automatic locking position of the coupling torque limiting in the form of a spring-loaded movable sleeve with a shank placed on the movable coupling half, and a turning stop with two contact surfaces fixed on an axis on the housing, with one contact surface located under the shank of the movable sleeve with the possibility of changing the contact point relative to the axis of the other surface under the movable coupling half. FIG. 2